Feature:1. This running heat-resistant engine can achieve faster speed, longer running time and longer engine life.2. Almost maintenancefree operation, longlasting performance. A good and wise choice you should make.3. Exquisite workmanship, easy to use and remove, without any professional requirements.4. The precisely balanced rotor has higher smoothness and reliability, and the highest speed.5. Suitable for popular climbing vehicles such as for TRX4 SCX10 90046 1/10 RC car.Specification:.Item Type: 550 Brushed MotorMaterial: Aluminum Alloy + Stainless Steel + CopperMotor Shaft Diameter: 3.175mm / 1.3inMotor Output Shaft: D Axle 29T / 21T / 35TRadiator Voltage: 5VRadiator Color: BlueRadiator Size: 38 x 33 x 40mm / 1.5 x 1.3 x 1.6inQuantity: 1 SetSuitable: For TRX4 SCX10 90046 1/10 RC Car and Other Popular Climbing VehiclesPackage List:1 x Motor1 x Heat SinkNote:1. Due to manual measurement, please allow an error of 12mm / 0.04‑0.08in. Thank you!2. The monitor calibration is inconsistent, and the color of the item shown in the photo may be slightly different from the actual object.